For now this isn’t in any organized order. I’ll clean this up at some point. Basically this is an analog synthesizer that comes with a Japanese magazine. People have been modding the crap out of it and have come up with some pretty interesting things. Two of those things are a midi to CV converter and an analog sequencer that can run on an internal clock or sync to an external midi clock. I will be building both. I thought it would be beneficail to some people to have all of the information in English, since most of the other sites contianing this info are in Japanese.

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First off, the mouser parts list; this does not include perfboard, a power source, or an enclosure, but that can be found at radioshack or similar electronics store relatively cheaply. There might be a couple of extra parts on this list and one of the diodes may not be exactly right. I had to guess as to a suitable replacement for one of them since I could not find the part number at mouser.

Excell spreadsheet:

sq150

Google Spreadsheet:

http://spreadsheets.google.com/pub?key=p17RsWocmYxKNITTgDhQHcA

And here’s the scheamatic for the sequencer, which I found here

and of course, the code for the atmel chip also found at the site linked above.

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Here’s a video some dude made of his SQ-150. This one’s in a nice wooden case. the SX-150 has also been rehoused in a case to match. Very stylish!

I marked up the front panel of my PT-10 enclosure to get a rough idea of how the controls are gonna be laid out.

I just have a little more to do on this, and hopefully I didn’t screw anything up. (The midi-cv converter for the sx-150 that I built didn’t work) I just may be able to get this finished tonight, the electronic bits anyway.

Update 5/26/2009 –

I finally had a chance to work on this some more. I’ve programmed the atmel chip and popped it in, and unfortunately I have some troubleshooting to do. It seems that none of the knobs and half of the lights are not working, and as such I cannot change the pitch on any of the 8 steps in the sequence. Sometime this week I’ll devote a few hors to try to get his thing up and running 100%. Wish me luck.

Update 8/12/2009 –

Unfortunately, I never got the SQ150 to work correctly. At some point, I’ll give building this thing another shot. Until then, here’s a pic of my unfinished sequencer: